I’m having the same issue that a number of people have reported. I have an AI file that has printed successfully in the past, but the Glowforge app now claims that some of its filled paths are open. Neither the AI Document Info panel nor the rj-graffix plugin report any open paths. I don’t want to rasterize the fills because there are thin areas involved and the dithering ruins them. Is there some other way to detect whatever the Glowforge app thinks is the problem?